Hydraulic Megastore Holmbury Inc: couplings@holmburyusa.com | +1 (866) 465-6287

FLAT

FAC

E CO

UPL

ING

S

HQ & H SERIESFlat face couplings made to the ISO 16028 Standard

INTRODUCTIONThe HQ and H Series flat face couplings are Holmbury’s flagship products, known globally for their leak free performance in high pressure pulse, hammer circuits and many other applications. Preferred choice for many global OEMs.

CONSTRUCTION• HQ Series (Sizes 06 to 25)- Carbon steel with zinc nickel

plating (1200 hours with no red rust in salt spray tests)• H Series (Sizes 32 to 40)- Carbon steel with trivalent plating• Fitted with Nitrile seals (Viton seals available)• Also available in AISI 316 stainless steel (See HSS Series)

FEATURES• Safety locking sleeve fitted as standard to prevent

accidental disconnection• Flat faces are easily wiped clean• Allows for minimal inclusion of air and contaminents

during connection• Flat face design prevents fluid loss during disconnection• Bidirectional flow

ACCESSORIES• Dust Caps, Plugs and Parking Stations are available for the

HQ Series

SPECIFICATIONS• Operating temperatures (With Nitrile seals): -40°C (-40°F)

to 106°C (223°F), (With Viton seals): -20°C (-4°F) to 200°C(392°F)

• Couplings have been tested to the ISO 7241-2 Standard

APPLICATIONS• Hammer circuits• High pressure pulse applications• Leak free environments• Construction plant, mobile equipment, general industrial,

nuclear, mining and agricultural industries

ORDER CODES

Body Size

Series

N = NPT

06 |10 | 12 | 16 | 19 | 25 | 32 | 40Thread Size

08 - ½” F = Female

M = Male24 - 1½” 20 - 1¼”

G = BSPP

04 - ¼”

06 - / ”

12 - ¾”M = Metric

16 - 1”

32 - 2”

Thread Type

HQ 19 M 16 G

S = SAEFS = ORFSR = BSPT

Blank = FemaleThread Gender

M = MaleHQ | H

Gender

J = JIC

--

Holmbury Ltd: sales@holmbury.com | +44 (0) 1732 378912 Hydraulic Megastore

Size Thread Size (A) B C D ØE F G ØH ØI ØJ

Maximum Working Pressure

Burst Pressure (Coupled)

Burst Pressure

(Male)

Burst Pressure (Female)

Dimensions in mm Bar

Dimensions in Inches Psi

HQ 06 1/4”22.0 27.0 53.8 28.0 54.3 97.0 24.0 29.0 16.2 400 1700 1220 1500

0.9 1.1 2.1 1.1 2.1 3.8 0.9 1.1 0.6 5800 24650 17690 21750

HQ 10 3/8”27.0 30.0 60.2 31.8 69.3 113.3 29.0 32.0 19.7 350 1500 1050 1100

1.1 1.2 2.4 1.3 2.7 4.5 1.1 1.3 0.8 5075 21750 15225 15950

HQ 10 1/2”27.0 30.0 63.2 31.8 74.2 121.5 29.0 32.0 19.7 350 1500 1050 1100

1.1 1.2 2.5 1.3 2.9 4.8 1.1 1.3 0.8 5075 21750 15225 15950

HQ 12 1/2”& 3/4”36.0 36.0 71.2 37.8 83.7 137.7 40.0 40.0 24.5 350 1200 1000 1050

1.4 1.4 2.8 1.5 3.3 5.4 1.6 1.6 1.0 5075 17400 14500 15225

HQ 16 3/4”36.0 41.0 73.1 42.0 83.9 139.8 38.5 45.1 27.0 350 1200 1100 1100

1.4 1.6 2.9 1.7 3.3 5.5 1.5 1.8 1.1 5075 17400 15950 15950

HQ 19 1”46.0 46.0 84.0 45.5 99.0 161.6 50.3 50.2 30.0 350 1450 1050 1050

1.8 1.8 3.3 1.8 3.9 6.4 2.0 2.0 1.2 5075 21025 15225 15225

HQ 25 1 1/4”55.0 55.0 90.4 55.0 106.2 173.3 59.7 59.7 36.0 260 800 800 800

2.2 2.2 3.6 2.2 4.2 6.8 2.4 2.4 1.4 3770 11600 11600 11600

H 32 1 1/2”70.0 70.0 119.8 79.0 118.5 209.5 77.0 79.0 57.0 250 1100 1200 1200

2.8 2.8 4.7 3.1 4.7 8.2 3.0 3.1 2.2 3625 15950 17400 17400

H 40 2”80.0 80.0 173.4 103.0 145.5 282.3 106.2 106.2 72.9 250 1000 1000 1000

3.1 3.1 6.8 4.1 5.7 11.1 4.2 4.2 2.9 3625 14500 14500 14500

FLAT FACE COU

PLING

S

HQ & H SERIES HQ & H SERIESDRAWING PRESSURE DROP CHARACTERISTICS

DIMENSIONS

= Optimum Flow Rate

PSI= Bar x14.5 Inches= mm/25.4